SXT Status Report
                       29 May - 11 June 1995 (Weeks 22 & 23)
                                  ---------

                                Nariaki Nitta
                                  11-Jun-95

     Following IAU Colloquium 153, there was little pressure to prepare
for meetings.  But we have started another busy period, being involved in 
two campaigns with Pic du Midi (to observe formation of loops) and with
Kitt Peak (to observe X-ray Bright Points).  The campaigns will continue
until 16 June.


SOLAR ACTIVITY

     The GOES level almost invariably stayed at A or low-B level, but
unlike the previous week, there were distinct active centers, so the
automatic region selection (ARS) did not pick up hot spots on the CCD.
Although we did not have major flares, we observed at least some
activity associated with a filament and an active region.


FILAMENT HUNT
    
     There were several occasions of coordination with Mees Observatory 
(U of Hawai'i) to observe filament channels and eruptions.  This time 
we observed a seemingly stable filament in good time resolution and 
found some structures growing in X-rays.  These may have had to do with 
partial dissolution of the filament as observed in H-alpha.  We also 
observed in full disk images disappearance of a filamentary structure 
and formation of a large loop on the limb, the latter apparently 
conincident with a CME that was observed at Mauna Loa. 
 

PIC DU MIDI AND XBP CAMPAIGNS
       
     We tracked AR 7877 for a couple of days.  The region looked like
an "anemone" type, and it was found to be growing.  It did not produced
major flares, but instead many small brightenings appeared.  Comparisons
with the high-resolution Pic du Midi data would be tempting.  So far
we have finished only one XBP run, in which an XBP in a coronal hole
channel was observed to flare.  We will continue the campaigns during the
week of 12-18 June.
  

SXT INSTRUMENT STATUS

     The SXT instrument continues to be in fine working order.  No error
occurred during this time frame.


CALIBRATION STATUS

     Thanks to Acton san's tremendous efforts during his last stay, we
now identify the pointings of missing terminator (sunset) images that are
used for straylight correction.  Hudson san and I agreed that three offpoint
commands be replaced with new ones to fill the wide gaps of the 
terminator database.  The new commands are now in place.  However, we enter
a period of fewer terminator images.


SEMINARS

     Two Yohkoh seminars were held and five people, young and old, spoke.  
On 31 May, there were three speakers: 
       K. Yaji  "On Non-thermal Emissions in the Hard X-ray and Microwave 
     Ranges from Flaring Loops",
       M. Kundu "Non-thermal Radio Emission from X-ray Jets" and
       T. Kucera "Thermal/nonthermal model of electron acceleration applied
     to solar flare data from CGRO/BATSE and Yohkoh".
On 7 June the speakers were:
       S. Krucker "Simultaneous Solar Observations with the VLA and Yohkoh
     of Type I Noise Storms" and
       H. Hudson "Yohkoh Detection of Mass Loss in the 24 Jan. 1992 CME 
     - Visions of Bugles". 


PERSONNEL

     Loren Acton and Greg Slater left on 28 May and 5 June, respectively.
Tom Metcalf and David Alexander are arriving shortly.

     
Week 22 Tohbans:
   SSOC: K. Marubashi, A. Ohkubo
   KSC:  T. Ishii, K. Fujisaki
Week 23 Tohbans:
   SSOC: M. Shimojo, M. Nishio
   KSC:  K. Fujisaki, M. Ohyama
SXT Chief Observer:
   Nitta, N.
SXT Systems and Data Engineer:
   Slater, G. (until 5 June)